BIND 10 #1452: add UDP socket passing to fd_X handling

[BIND 10 Development]

#1452: add UDP socket passing to fd_X handling
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                   Reporter:  jelte  |                 Owner:  jinmei
                       Type:  task   |                Status:  reviewing
                   Priority:  minor  |             Milestone:
                  Component:  DDNS   |  Sprint-20120110
                   Keywords:         |            Resolution:
            Defect Severity:  N/A    |             Sensitive:  0
Feature Depending on Ticket:  DDNS   |           Sub-Project:  DNS
        Add Hours to Ticket:  0      |  Estimated Difficulty:  5
                  Internal?:  0      |           Total Hours:  0
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Comment (by jinmei):

 Replying to [comment:17 vorner]:

 > > As I worked on the python wrapper part of this task I noticed I
 > > overlooked a few more corner cases in this branch.  So I revised the
 > > branch to handle these cases.  Could you check these changes, too?
 >
 > These look OK.
 >
 > Anyway, it started to fail to compile for me. It doesn't seem anything
 relevant changed here, though.
 >
 > {{{
 > cc1plus: warnings being treated as errors
 > ../../../../../src/lib/util/io/fd_share.cc: In function ‘int
 isc::util::io::recv_fd(int)’:
 > ../../../../../src/lib/util/io/fd_share.cc:106:47: error: dereferencing
 type-punned pointer will break strict-aliasing rules
 [...]
 > }}}
 >
 > Did you do anything regarding it? I guess we should try to be aliasing
 save, and if not, disable the strict aliasing uptimisations for the given
 objects.

 Ah, sorry, yes, I removed this from Makefile.am
 {{{
 libutil_io_la_CXXFLAGS = $(AM_CXXFLAGS) -fno-strict-aliasing
 }}}
 as I thought it was because we previously compiled this with
 dependency on asio (which requires -fno-strict-aliasing) and we now
 didn't need it (and in fact it compiled for me without the flag).  It
 was apparently too aggressive.

 Since it's not directly related to the subject of this branch I could
 revert to the original setting.  But I also think it's a good
 opportunity to make it cleaner.  I believe the attached diff
 (makefile.diff) should solve the compilation problem for you.
 (Assuming so) I'm okay either with applying this cleanup or with
 reverting to the previous Makefile.am

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Ticket URL: <http://bind10.isc.org/ticket/1452#comment:20>
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